Rakuga Kids (Nintendo 64)
CheatingDome.com
Alternate costume colors
Press the various Punch and Kick buttons while choosing a fighter on the character selection screen.
Extra options
Accumulate over ten hours of total game play. An "Extra options" selection will appear on the options menu.
Fight as Darkness
Accumulate over five hours of total game play. Darkness will now be selectable at the character selection screen.
Fight as Inoz
Accumulate over two hours of total game play. Then, hold L while choosing Mamazo at the character selection screen.